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Biaxially oriented polyester film and method for manufacturing same

A technology of polyester film and biaxial orientation, applied in the field of polyester film, can solve problems such as easy dissolution of oligomers, reduction of film appearance quality, and damage to the flavor of the content

Inactive Publication Date: 2019-11-22
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, biaxially oriented polybutylene terephthalate films mainly contain oligomer components such as cyclic dimers and cyclic trimers, and these oligomer components are subjected to high-temperature heating such as retort sterilization. During processing, there is a problem that oligomers remaining in the film are easily eluted, causing a decrease in the appearance quality of the film, or destroying the flavor of the contents.

Method used

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  • Biaxially oriented polyester film and method for manufacturing same
  • Biaxially oriented polyester film and method for manufacturing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0175] Using a single-screw extruder, melt PBT-1 and silica particles having an average particle diameter of 2.4 μm as inert particles so that the silica concentration becomes 1600 ppm and melt at 270° C. The melt line leads to a 12 element static mixer. In this way, the polybutylene terephthalate melt is divided and stacked, and a multilayer melt made of the same raw material is obtained. It was cast from a T-die at 270° C., and adhered to a cooling roll at 15° C. by an electrostatic bonding method to obtain an unstretched sheet.

[0176] Next, 3.5-fold roll stretching was carried out in the machine direction (MD) at 60°C, followed by 4.0-fold stretching in the transverse direction (TD) at 90°C by a tenter, and a tension heat treatment was performed at 210°C for 3 seconds and 1 After a 5% relaxation process for a second, 10% of the holding portions at both ends were cut and removed to obtain a mill roll of a polybutylene terephthalate film having a thickness of 15 μm. Table...

Embodiment 2～7、 comparative example 1～5

[0178] In Example 1, the polybutylene terephthalate resin used, the composition of raw materials, and the film-forming conditions were changed to the biaxially stretched film recorded in Table 1 or Table 2. In addition, the same as in Example 1 Do the same. Table 1 or Table 2 shows the film forming conditions, physical properties, and evaluation results of the obtained film.

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Abstract

[Problem] To provide a biaxially oriented polyester film that has excellent shock resistance, flexibility, and uniform mechanical characteristics which are suitable for a food packaging material thatis subjected to boil sterilization and retort sterilization treatments and that is less susceptible to elution of oligomer components in the film. [Solution] A biaxially oriented polyester film characterized by having features (a) to (d). (a) The film comprises a resin composition containing 60 mass% or more of a polybutylene terephthalate. (b) The thickness precision of the film in a width direction is 1 to 20% or less. (c) The amount of the oligomer component in the film is 2,000 to 12,000 ppm. (d) After heating the film at 66 DEG C for two hours, with the film soaked in a 50% ethanol watersolution, the mass of the oligomer component eluted into the 50% ethanol is 0.02 mg or less per 1 square inch of the film.

Description

technical field [0001] This invention relates to the polyester film used for the packaging material of the content which requires heat sterilization at high temperature, such as a boiling sterilization process and a retort sterilization process. More specifically, it relates to a biaxially oriented polyester film having excellent impact resistance, bending resistance, mechanical strength, and uniform mechanical properties, and in which oligomer components contained in the film are not easily eluted, and a method for producing the same . Background technique [0002] As a packaging material for retort sterilization or retort sterilization, for example, a laminated body in which at least a transparent film base layer having gas barrier properties, an adhesive layer, and a sealant film layer are sequentially laminated is used. Disclosed is a technique of using a biaxially stretched multilayer film made of a polyamide resin layer formed of a polyester resin layer and a polyamid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C48/04B29C55/12B29C48/16B29C48/21
CPCB29C55/12C08J5/18B29C48/16B32B27/36B32B2307/518B32B2307/50B32B2439/00C08L67/02C08G63/181C08J2367/02B29C48/022B29C48/21B29C48/0018B29C55/005B29C55/143B29K2067/00B29L2007/008B29L2031/712B32B27/08B32B2250/05B32B2553/00
Inventor 后藤考道玉利昇
Owner TOYOBO CO LTD
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